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Szl2110:Entomology I Question Paper

Szl2110:Entomology I

Course:Bachelor Of Crop Protection

Institution: Meru University Of Science And Technology question papers

Exam Year:2013

QUESTION ONE (30 MARKS) – Compulsory
a) Describe briefly the skeletal structure of insects. (3 Marks) b) State three types of ectognathous mouthparts found in insects. (3 Marks) c) i) Draw a typical insect leg. (3 Marks) ii) Describe any three terrestrial functional modifications in c(i) above. (3 Marks) d) i) Describe the diversity of the larval stage in typical holometabolous life cycle. (3 Marks) ii) Explain the growth curve below characteristic of insects. (2 Marks)
Time (day)
e) Explain why if the brain is removed, the insect will still walk steadily forward. (2 Marks) f) i) Differentiate between open and closed respiratory systems. (2 Marks)
a
b
Lenght (cm)
2
ii) Describe briefly adaptations of the tracheal system in adult dipterans. (4 Marks) g) Reproductive characters are of great significance in insect taxonomy. Describe briefly the common asexual reproductive characters. (5 Marks)
QUESTION TWO (20 MARKS)
a) Discuss the chewing – lapping mouthparts as found in the sawfly. (10 Marks) b) Explain how the mouthparts of the cockroach differ from those of the sawfly. (10 Marks)
QUESTION THREE (20 MARKS)
a) Describe seasonal cycles of insects. (6 Marks) b) Discuss the dispersal and migration of insects with reference to i. Locusts (7 Marks) ii. Army worms. (7 Marks)
QUESTION FOUR (20 MARKS)
a) An armateur entomologist has difficulties differentiating between members of the orders Homoptera and Hemiptera. Explain how you would guide him/her in the task. (10 Marks) b) Explain how to carry out insect sampling from vegetation. (10 Marks)
QUESTION FIVE (20 MARKS)
Discuss the economic importance of arthropods. (20 Marks)

Szl2110:Entomology I Question Paper

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